# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: site-packages\sqlalchemy\connectors\pyodbc.py
from . import Connector
from .. import util
import re


class PyODBCConnector(Connector):
    driver = "pyodbc"
    supports_sane_rowcount_returning = False
    supports_sane_multi_rowcount = False
    supports_unicode_statements = True
    supports_unicode_binds = True
    supports_native_decimal = True
    default_paramstyle = "named"
    pyodbc_driver_name = None

    def __init__(self, supports_unicode_binds=None, **kw):
        super(PyODBCConnector, self).__init__(**kw)
        if supports_unicode_binds is not None:
            self.supports_unicode_binds = supports_unicode_binds

    @classmethod
    def dbapi(cls):
        return __import__("pyodbc")

    def create_connect_args(self, url):
        opts = url.translate_connect_args(username="user")
        opts.update(url.query)
        keys = opts
        query = url.query
        connect_args = {}
        for param in ("ansi", "unicode_results", "autocommit"):
            if param in keys:
                connect_args[param] = util.asbool(keys.pop(param))

        if "odbc_connect" in keys:
            connectors = [util.unquote_plus(keys.pop("odbc_connect"))]
        else:

            def check_quote(token):
                if ";" in str(token):
                    token = "'%s'" % token
                return token

            keys = dict(((k, check_quote(v)) for k, v in keys.items()))
            dsn_connection = "dsn" in keys or "host" in keys and "database" not in keys
            if dsn_connection:
                connectors = ["dsn=%s" % (keys.pop("host", "") or keys.pop("dsn", ""))]
            else:
                port = ""
                if "port" in keys:
                    if "port" not in query:
                        port = ",%d" % int(keys.pop("port"))
                connectors = []
                driver = keys.pop("driver", self.pyodbc_driver_name)
                if driver is None:
                    util.warn(
                        "No driver name specified; this is expected by PyODBC when using DSN-less connections"
                    )
                else:
                    connectors.append("DRIVER={%s}" % driver)
                connectors.extend(
                    [
                        "Server=%s%s" % (keys.pop("host", ""), port),
                        "Database=%s" % keys.pop("database", ""),
                    ]
                )
            user = keys.pop("user", None)
            if user:
                connectors.append("UID=%s" % user)
                connectors.append("PWD=%s" % keys.pop("password", ""))
            else:
                connectors.append("Trusted_Connection=Yes")
            if "odbc_autotranslate" in keys:
                connectors.append("AutoTranslate=%s" % keys.pop("odbc_autotranslate"))
            connectors.extend(["%s=%s" % (k, v) for k, v in keys.items()])
        return [[(";").join(connectors)], connect_args]

    def is_disconnect(self, e, connection, cursor):
        if isinstance(e, self.dbapi.ProgrammingError):
            return "The cursor's connection has been closed." in str(
                e
            ) or "Attempt to use a closed connection." in str(e)
        else:
            return False

    def _dbapi_version(self):
        if not self.dbapi:
            return ()
        else:
            return self._parse_dbapi_version(self.dbapi.version)

    def _parse_dbapi_version(self, vers):
        m = re.match("(?:py.*-)?([\\d\\.]+)(?:-(\\w+))?", vers)
        if not m:
            return ()
        else:
            vers = tuple([int(x) for x in m.group(1).split(".")])
            if m.group(2):
                vers += (m.group(2),)
            return vers

    def _get_server_version_info(self, connection):
        dbapi_con = connection.connection
        version = []
        r = re.compile("[.\\-]")
        for n in r.split(dbapi_con.getinfo(self.dbapi.SQL_DBMS_VER)):
            try:
                version.append(int(n))
            except ValueError:
                version.append(n)

        return tuple(version)

    def set_isolation_level(self, connection, level):
        if hasattr(connection, "connection"):
            connection = connection.connection
        if level == "AUTOCOMMIT":
            connection.autocommit = True
        else:
            connection.autocommit = False
            super(PyODBCConnector, self).set_isolation_level(connection, level)
